1. Statens Serum Institut, Copenhagen, Denmark
2. Danish Veterinary and Food Administration, Glostrup, Denmark
3. Department of Clinical Microbiology, Zealand University Hospital, Slagelse, Denmark
4. Department of Clinical Microbiology, Copenhagen University Hospital, Hvidovre, Denmark
5. Department of Clinical Microbiology, Odense University Hospital, Odense, Denmark
6. Department of Clinical Microbiology, Aarhus University Hospital, Aarhus, Denmark
7. Department of Clinical Microbiology, Lillebaelt Hospital, Vejle, Denmark
8. Department of Clinical Microbiology, Copenhagen University Hospital, Herlev and Gentofte, Denmark
9. Department of Clinical Diagnostics, Hospital South West Jutland, Esbjerg, Denmark